In the UK there are still some bargains to be had. On Saturday at a local car boot sale I walked away from -
A tidy Zenit with a very very tidy Helios 44-2, a Hanimex28-80 zoom and a bag for £10
Another Zenit, broken, with a Soligor 135, a 80-200 zoom of some sort, and a bag with some old flash guns and filters, also for £10.
A Praktica with a Pentacon 30mm, 50mm and some crappy zoom, in a bag also with a flash and some filters for £50.
A local 'antique centre' ( junk shop ) has a Zenit with a 44M and a small zoom, I can't remember what, in a bag for £25.
All the lenses were M42 and perfectly useable, it's just that I have most of those already, and 4 Zenits and 4 Prakticas that I really don't need!
but I bought to get the lenses I wanted.
There's good stuff out there, I've bought all the Helios, Soligor and Pentacon lenses listed above and more from car boot sales and junk shops, I've even found very tidy Takumars for way less than the Ebay prices.