I went all grain a while ago, biggest "cost savings" I've noticed so far, also buying mlat in bulk through group buys; although the buy-in can be a bit much, it's worth it... I put "cost savings" in quotes because I still spend the same amount of money I did before (probably more), I just spend the bulk of it on equipment now
I do BIAB AG on the stove-top (mash, sparge, full or partial boil depending on how I'm feeling htat night)
base malt is $0.80/lb+/- specialty malt is $0.90/lb+/- (I buy 50lb sacks or split sacks of specialty malt)
I buy bulk hops separate and freeze at $10/lb or less so like $0.63/oz
I have food-grade air tight bins for storing the malt (I don't remember how much they cost)
My induction ready 8 gal (32 qt) pot was $80+/- (no ball valve)
--you can buy them for $110 with ball valve now on amazon
grain mill was a gift ($100-$200 depending on your choices)
kegging gear - I've lost track how much I've spent on kegging gear, I don't remember how much my CL chest freezer was, I built a collar, and was gifted two 630ss tap setups but will be buying two more, as well as a new regulator and misc lines/connectors etc.
as far as ingredients go - a 5 gallon "finished" batch of a SMaSH is ridiculously cheap - ingredients are about $10+/- (malt, hops, yeast). That doesn't include sanitation, CO2, electric etc. and I'm on a well so water costs are moot. But still, way cheaper than any other method.
ALSO you know you're a homebrewer when - you try to convert others to AG by explaining that although it won't save them money, it will give them more beer per dollar spent.
I also just blew a couple hundey-sticks on ball lock kegs I didn't exactly need; I just couldn't pass them up, I may need them some day