These guys http://www.benscycle.net/ helped me out with a pair of conti 650 tubs, they are pretty helpful and you can make a deal with them (I just told 'em what I could afford). I know they had loads of 650 velocity rims for around £5 some drilled some not last autumn... e.g. http://www.ebay.com/itm/VELOCITY-Pro-Elite-650c-TRI-RIM-18-hole-Charcoal-/380413205544?pt=Cycling_Parts_Accessories&hash=item589264dc28
@Jay75 started
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These guys http://www.benscycle.net/ helped me out with a pair of conti 650 tubs, they are pretty helpful and you can make a deal with them (I just told 'em what I could afford). I know they had loads of 650 velocity rims for around £5 some drilled some not last autumn... e.g.
http://www.ebay.com/itm/VELOCITY-Pro-Elite-650c-TRI-RIM-18-hole-Charcoal-/380413205544?pt=Cycling_Parts_Accessories&hash=item589264dc28