Something is fishy there but then it is Oh Really auto parts. Just bought a couple gallons of T6 and I paid 23 a gallon at the farm store. I think I'd avoid that store like the plague.
Keep in mind that T6 is a synthetic (cracked from natural Gas of all things) and T4 is a semi synthetic (T6 base stocks plus conventional petro based oils).
That T6 price per gallon is 3 times what I pay for full synthetic (Chevron THC Synthetic hydraulic oil).
I slapped Oh Really's a while ago on their price match guarantee on brake fluid (Dot 4). Menards had it regular price of 6 bucks a quart so I took a picture of the price below the rack (which was empty) and swung by Oh Really's where it was 10 a quart, had the picture on my phone and told them to match it (needed a couple quart bottles...) they did grudgingly.
What you needed to do, go somewhere where the price was actually sane, snap a picture of it and go back and rub their nose in it.