Well I'm a little late in responding, lol.
Yes, you can prune the fading blooms off.
I don't have any for trade right now- but I'm starting some more mame (very tiny bonsai) soon. Remind me later this year and I'll see what I have to offer.
Would you like a Berry Bonsai? I think they are a form of hollyberry bushes- they grow wild here. Can get you a ton of nice shaped ones for shipping if you want. I believe you can only grow these outside though. When they put off berries- they are solid red with them. I have a few I'm training for my personal collection now. LMK. ;-)