I have a stazon reinker I bought a couple of years ago from a local shop. I find the effect doesn't last all that long, but having said that, the bottle is still over half full and I've used it a lot. I just put about 5 dots on and spread them over with half an old credit card. I leave the pad right way up for it to soak in for a while before using and it is effective for a couple of weeks (depending on how much I use it). Sometimes I wrap the pad in cling film to kep the air out. Mostly I'm lazy and don't - can't really say if makes a difference -I just feel more virtuous!
Have you tried ebay?
hugs janet