The TL072 is a super common op amp, just look for a different manufacture or a better spec'd chip (595-TL072ACP or BCP). I have a whole tube of the BCP parts so if you need those, let me know. LM13700 are available from futurlec (and I have a few of those too). If you order from futurlec know 2 things: a) order as much as u can, their prices are dirt cheap for just about everything so stock up on alpha pots, headers, crimp pins, whatever. b) they come out of Thailand so it will take several weeks to get your parts.
I'm actually glad I looked up the LRC caps at newark since the radial ones I have (the square ones) wont fit on the SSM PCB but the axial ones that Newark stocks domestically are only 5mm in diameter which most definitely will fit and are acutally smaller and better spec'd than the styroflex parts