This is very controversial, but have a go at Black Label. In my opinion, it is one of the heavily undervalued whiskeys. Otherwise, I found Scotch to be expensive in the US, but I got a bottle of Monkey Shoulder for around 30 bucks which did Okay. Not very peaty, but it does the job on a budget.
If you don’t mind going a little higher, Laphroaig, Caol Ila, Lagavulin, Talisker are the usual suspects. On a budget I would say don’t worry about age too much. 10y Laphroaig is fine! Age is easily overvalued (because it markets easily with people who are afraid to admit they don’t know), as is single malt. Not saying it doesn’t matter; I just find it hard to justify the price hike, sometimes. Although for peat, single malts do tend to be better, unfortunately. :)