Lets see... I have a list.
BM starter membership is $50 for life. Now I saved twice that on my first piece, since then I probably saved near $600 with the 5-6 pieces I bought. Moreover, you can buy direct from upcoming artists before they could be famous. Personally I wouldn't dismiss that option because of the cost.
TLeaf are great for internet orders. I have bought several nice pieces from them. You can get 15% on any non sale piece if you know the secret handshake. Google is your friend here. Not sure about the rules here because its from another forum.
Overall, you want a deal, friend or like these glass shop’s Facebook page. For example several are having 15% off Halloween sales with coupons posted at the moment. The DabLab is one...
Another option, buy artist direct. Collie glass is an excellent example. There are many others.
ALT rarely has sales, like twice a year. Black Friday is one I believe as is 4/20 & 7/10
Another thing you will find all glass shops have their local artists, so the best selection is there, but I see you are after common production pieces, so pricing pounding is easier. Especially on a piece like that, just wait for the typical 10-15% coupon.
I'll edit this when I get to my desktop for my list of shops, but in Portland I know areas where are 4-5 glass shops in as many blocks.
NVS does not list prices on the web, you must call them. Their selection for scientific is one of the highest, but they only have sales on big dates like 4/20, 7/10 etc. I live about 5 miles away.
Some stores don't have an internet shore. Piece of Mind which has 12-14 stores doesn't, but using the phone works there. What is good about that they buy for all stores together on pieces like that so the volume equals lower prices.
The best shop in Portland is Mellow Mood. I am afraid to go there. Their heady wall is awesome and the selection is large. However, no web store. Great prices and med users get 10% off i.e. you have your medical card (many stores here do with a OMMP card)
I do understand its hard to window shop without a web store.
so some of my favs in no order.
http://functionalglassart.com
http://www.highpriorityglass.com
http://www.thedablab.com
http://www.thedabstore.com/
http://www.theheadcenter.com/
http://www.tobaccoleafonline.com
http://www.42degreesglass.com/
http://www.bitfreakglass.com/
https://store.kultureva.com/
http://www.pipesdaddy.com
http://smokinjs.com/
http://www.dabcity.com/brands.html