HAVE: Have: floaters and oxygenators
For the cost of postage via PayPal or for trade, I have:
Tons of hornwort -- at the top of my waterfall, it keeps my waterfall rocks completely free of string algae. No idea how it works and no guarantee it'll work for yours :-)
Water celery -- also called water parsley, this can be potted or just held in place with rocks, I have it in a basket of gravel and it's growing like gangbusters
Water hyacinths -- big ones, in their prime. If you're in a warm climate you could have these for quite awhile longer and they'd probably bloom for you as they're in the "mood" :-)
Water lettuce -- sizeable, with many offshoots on each rosette. Some are a little bleached out from the sun but with a bit of shade should green up right away
Send me an email if you're interested, our season is starting to wind down so if anyone out there has a few months left of warmth you'll definitely get more use out of these than I will.