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I know that round plastic 20mm bases are made by someone, but I have no idea who makes them. Does anyone know?

Proxie Models sells a version that I might go with, but I was thinking more along the lines of a standard slotta base.

I wanted to order mdf bases from GF9, but as far as I know they don't sell bases any more.

So, any suggestions anyone?

Try ebay.
Packs of 100 there for under £5, and that was just searching '20mm round bases'