i have a kid, so i'm broke AND also limited on time
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My schedule lately has been about every 2 weeks i brew a batch... I also have a VERY simple electric brewery, so no propane purchases! saves cash there.
I pretty much ALWAYS use dry yeast (haven't tried washing yeast yet, but with most yeasts i use are under $4, so that is fine with me)
buy in bulk unless your LHBS is cheap (the bulk bag at my LHBS is $30 bucks, which is their price if you bought 50lb of grain by the lb anyways, so no savings)
I always buy an extra thing of hops or yeast when i go for the most part... wanna brew an IIPA but, the hops are outrageous? everytime you go, spend $3-4 on a sack of hops and spread it out. helps a bit! unelss you buy by the pound.
Do the same with bittering hops too... i use herkules mostly (17% usually) and a 2oz bag is about $2... so every 2-3 trips i just get another pack.
Thats what i do, and 2 normal batches is about 1/2 my normal spending money a month, so it stretches the budget a bit
I had fun with doing low gravity brews lately, 'cuz they were super cheap and i could pound a bunch, but also with pounding a bunch... i ran through them quick, so back to moderate alcohol beers for me!