I use Original HPW, which is a bit more complex than instant (because it's not instant, lol). You do have to buy the wambaroo powder online, which some people don't like, but you can buy it in bulk (I have one glider so I don't do this, but it's a perk) and some places sell the bee pollen along with it (I like to get them together online, since bee pollen in the stores isn't that big).
For my single glider, I make half the recommended batch and use it for like 3 months. Two gliders would use the whole batch for 3 months.
When looking at the price, I felt like it was a pretty cheap diet. I didn't look up the price of BML.
They do have this diet and all the other diets on Gliderpedia.
I felt HPW gave me more variety with choosing fruits/veggies than BML, and less ingredients, so that's why I chose it. Ordering online doesn't bother me. He loves it