Hi Brian, most of the brands to look out for are in my post above, although there are a number of others you can only get in the UK. I still have quite a few Series 7s including some larger sizes - 2s, a couple of 3s and a 5 (30 quid or more in the shops now!) - that I got years and years ago, I long ago got into the habit of using synthetics for any large areas so they see little use and they're still practically new. Any of the younger ones were carefully hand-picked from the shelves. I used to work in a studio where we ordered these in 10 at a time and they were so good you'd rarely see a bad one, but I've been disappointed a number of times since then with brushes not lasting as long as they used to despite their price (and careful handling) and checking them in stores I've often found only one brush in a bunch is quite as good as it should be. With their price climbing despite this I just had to look for alternatives.
Of the makers listed above, the ones I've tried myself that I'm really happy with are DaVinci Maestro, Escoda 1208 series and Blick Master Sable. I thought I had one or two Raphaëls but I can't find them, one of the problems is that the gilt lettering often wears off the handles with use so I'm partly relying on memory on what I've bought because a few are blank
When I bought the DaVinci brushes they were a little cheaper than Series 7 at retail prices in London, you can find them for quite a bit less online; they are superb quality, equal to or better than what you're used to. The Escodas are very good but not quite at the level of Series 7 at their best in the small sizes I've tried (roughly the same as 00) but I want to try one or two of the larger sizes. The Dick Blick brushes I haven't had the chance to use much but after doing a couple of projects with them they seem to be very good so I'd recommend trying if you have the chance.
I also have some Rowney S40s. These are/were made in the Dominican Republic, even though I only bought them a couple of years ago I suspect they were old stock or they'd say Daler-Rowney on the side instead of just Rowney, so I don't know if they reflect the current standard for this brush. I haven't used them enough yet but overall they seem pretty good but not top notch, I'd say try them if the price is right. I also have some S34s, a cheaper red sable range, but I haven't used them yet.
If you pass through London on the way to Euro and you have some free time there are a couple of other options, two of the art shops have their own line of brushes (probably re-badged brushes from a major maker) and the range I've tested that suits me best is "Series 1A Kolinsky Sable" from Green & Stone in Chelsea, near Sloane Square. These have longer bristles than Series 7 so they can take getting used to but they have a good spring and the price is right.
The other one is much closer to the centre of London, L. Cornelissen & Son, just down the road from the British Museum on Great Russell Street. The range I tried is "Kolinsky Red Sable 80A" which aren't quite as good in the ones I have but still woth a shot. I also got a Roberson red sable set there I think but I haven't used these yet.
On the cheapish end of the scale I picked up some "Premier P33" brushes from Germany in Cross's in Folkestone that are hobby brushes but actually quite good, being about the same as name-brand synthetics without the risk of the dreaded hooked tip. I use these lightly as they probably won't last as well as an expensive brush but I'm pretty happy with them and they'd make a good starter brush.
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I might as well make this the go-to thread for future reference so if anyone wants to try ordering online
Dick Blick is around the cheapest you'll find and their service is great, but shop around, I don't bother looking elsewhere much any more so I could be missing someone - try
All Art Supplies,
MisterArt,
Pearl,
Italian Art Store and
RexArt.
Brian, if you want to order online in the UK
Ken Bromley's prices are pretty good (by our standards, not a snip on American sites I hate to say) and they also do their own line of brushes you might like to try if you're ordering anyway. Those in the UK could also try
Art Express,
ArtDiscount and
The SAA.
Einion