They’ll probably be fine, I’ve had cheap 2032s from ebay and they were OK. I wouldn’t have lights powered by them though, aren’t you having to change them every day or two? You can’t store much power in a 2032.
Got a 10x duracell ones off ebay quite cheeply and they’ve been fine, had a blister pack of unknown brand ones off ebay very cheaply and they lasted about 5 minutes each, leaked and mullered my HRM strap. So saving 50p cost me £35.
I recently got these Maxell branded ones off ebay, 10 for £1.50 – which is just about as cheap as anything else suggested for proper branded ones (admittedly I’ve not yet tested any, but unless they’re actually fake they should be decent quality). http://www.ebay.co.uk/itm/121184412616
(thanks for the reminder, I need to order some more)
I used to use supplementary lights that were great but took 2xCR2032. I realised how crap it was to be bulk buying them and tossing them all in the recycling, so I got a cheap clip on rear light that is far brighter and takes rechargeable AAAs.
The trouble you’ll find with rechargeable 2032s is that they’re unprotected and typical consumer devices which use them will likely drain them low enough to damage them. Personally I don’t get through them that quickly – I don’t have any lights I use regularly which take them, though need a supply as I have them in a wide variety of different things including my backup lights.