Really, Amazon seems to have the best pricing unless in store sales happen. This is mainly true if you have orders over their $35 free shipping minimum. Just don't expect it before January at this rate with the insane holiday buying.
For example, you can get 32 oz bottle of the product in question for less than $20 on Amazon. That is the best price per ounce you will, AFAIK. Considering you pay $11+ for 15 ounce bottle and $8+ for 10 ounce.
I'm probably just going to get that one from now on and replace as necessary; only adding to the ratio they recommend.
I forget what direct linking rules were on the boards just search Lubegard 40902 on Amazon's website. That is the p/n for the 32oz.
30901 is the 15oz
30902 is the 10oz
IF you want a good buy otherwise their 98901 on Amazon has basically the 15oz Biotech EP for $10 or so and their own Engine Flush (idle cleaning type you add prior to draining after OCI) and it claims to have no solvents so you may like that package.
95030 is their flush on it's own. Also, they have an updated fuel system cleaner (77012) with PEA I want to try next time since I've tried RP's newer product and had already used Techron/Red Line SI-1 before.
I considered using their flush myself, but after using Lubro Moly and Amsoil engine flush products already; and inspecting the clean valve-train I don't have a need for an idle flush for peace of mind unless I were to want that after 1 year OCIs.
That ofc I am hoping to get to after soon confirming no more coolant in the oil!
EDIT: I got all the p/ns off amazon I have them on my wishlist. Not sure if better pricing in store on some of the items like at O'Reilly or Napa, etc. but can't really beat Amazon.