Pismo is a world-class art glass gallery. If you live in Denver and you consider yourself a fan of art, you need to go.
Having said that, I don't recommend buying here (at least not unless money is no object). Many of the artists you'll find in Pismo have work for sale on eBay. I've purchased stuff from museum and private collection sales that rivals everything Pismo has yet carries a 10th of a price tag (yes that's right I said a factor of 10).
If you're looking for an exclusive, one of a kind piece, Pismo is your best bet. If you're looking for some nice glass and you're not interested in lining some gallery owner's pockets (don't kid yourself, the gallery makes the money here), check out a little website called ebay.