I started with a few tins online and then poked around at my B&M shop.
I had to set a threshold for myself to conform my smoking habit to my modest blue collar income.
The magic/arbitrary number I chose was $3 per ounce. If I can obtain tobacco I enjoy for that price, I feel satisfied and sustainable.
Some, like the D&R can easily be had for less. Other, "fancier" blends will occasionally push the bar higher. Then, there's the nice, aged treats.
Do lots of window shopping. Get a "feel" for the sale cycles and plan for medium-long range purchases.
If you like a particular blend, do a web search regularly and study it some. For instance, most of us know that once per year, a popular forum sponsor is going to put the Peter Stokkebye bulks on a 20% sale and we time large purchases accordingly.
Give thanks to the tobacco gods by occasionally getting some goodies at the local shop, planning to spend more. Look for opportunities to "give" and "receive". I recently grabbed some aged Virginias at a cost well above my normal limit because the seller had unexpected bills to pay and is considered a forum friend.
Stop buying clothes and food and such, as they all take up valuable real estate that is needed for canning jars full of tobacco.....