Here are a few of my thoughts on low cost options for stems:
I have been using my TA3 with a glass hula stem, which works okay but it does get a bit hot for my liking and isn't the best experience in terms of tactile feel (it's a bit top heavy). I am yet to use the TA with a WPA but I just have simple glass one. I heard that the Sneaky Pete Littlefinger adapter works well as it has the glass bands for easy handling. The TA does pump out hot vapor so I think it would be improved by some cooling if you were planning to use it natively as a stem. One low cost option is to use a J hook and the WPA, which will add more cooling. You could even add some beads to the j hook for even more cooling.
For wood, the cheapest route if you wanted a stem and the ability to use through glass would be to buy the HydraVong stem and either use standard condenser with no mouthpiece or add in XL condenser with a spinning mouthpiece. Alternatively use a third party condenser to get nicer mouthpiece. There are a ton of custom wood stems out there but it is more tricky to find one that can also be dropped into a bubbler like the HydraVong unless you make sure you choose a mouthpiece that has the 10mm adapter (TRWW do have one).
For glass stems you have the BB range (BB3, BB6, BB9). I like these as they have built in WPA unlike the hula stem I am currently using. However, i still think they lack the heft needed for the heavy TA and are a bit of a pain to clean. After much research and deliberation, I have ordered the Vaphit glass DNA stem as this looks perfect to me. It has a larger diameter making for easier handling with a heavier tip, it has a cooling helix, airport, fits a 10mm connector for use in water and it is two pieces for easy cleaning. It seems a great price and comes with a carry case you could use for stem, TA and accessories.
VGoodiES have it pictured on their site with a TA so it seems like a match made in heaven.