I m actually looking for a new set of replacement ear tips as well, but be forewarned about the tips from Comply. I ordered a set of 10 pieces from Comply in August since my old set of 10 (of the TX-500) had been all used up. The TX-500 (circa June 2011) had been terrific for me but since I had moved from the IE8 to IE80 (which has the wax protector built into the ear piece) I figured I didnt need that feature from the comply tips, so I I ended up ordering a set of the T500.
However after using just one pair of the pieces, I ve sworn off them! The foam quality in the new ones are just real **** - I guess the company figured they could sell more if they made them to disintegrate in 2-3 weeks. The old set from 2011 was amazing and lasted a yr (about two months a pair since i take excellent care of my earphones) so I m really disappointed in the quality. Considering these tips cost as much as some entry-level headphones (~23 shipped), I was really disappointed.
However it looks like there aren't a ton of other alternatives which is a real shame - ACS's gel tips seems really expensive but seems like a more long-term replacement. Will do more research, but if any of you folks have other suggestions, please let me know!