In these rather uncertain times, I'd forget spending all that money on an EOS 3 for a while yet and perhaps try an EOS 30 instead? You should be able to find one in excellent to mint- condition for around the £60 mark if you shop around and bide your time. It will do 90% of what an EOS 3 will do, plus it's smaller, lighter and considerably quieter. With a 35 zone metering system derived from the EOS 1V, I genuinely believe the EOS 30/30V is one of the best 35mm film SLRs Canon ever made.
However, make sure you go for the EOS 30 with eye-controlled focus system, as the similar looking EOS 33 is without that feature, so aren't as desirable and (should) sell for less money (as they did when new), Look for the logo on the front below the EOS 30 lettering to be sure.
I've owned an EOS 3 from new, and have two EOS 30s and an EOS 30v so I speak from first hand experience here. In case you're wondering, the 30v is the updated model and is virtually the same as a 30 but with crackle finish black instead of smooth matt/satin paint on the metalwork, a backlight on the top LCD panel and brighter LED AF point confirmation square in the viewfinder, but you'll most likely have to pay £130+ for a good one, and that's if you can find one for sale, as they really were the last of the 35mm film cameras so there aren't very many around as most people were buying digital cameras by then. So the EOS 30 is much better value for money, and far more plentiful in terms of availability.
Don't get me wrong, the EOS 3 is a very nice camera that's packed with features, but it's quite noisy when firing the shutter and not particularly light or compact. Hence the reason I use my 30/30v far more often than my EOS 3. Put an EF 40mm f/2.8 STM pancake lens on an EOS 30 and you hardly know you're holding an SLR!
Both cameras pictured here are fitted with their respective, optional extra, power winder/battery packs, but should give you some comparative idea of size. Hope the above is useful and best of luck choosing your next camera.
