What is your average price per brew? Obviously, AG is cheaper. Growing your own hops helps. Harvesting yeast helps.
I am at the "mostly grain" stage. My cost comes in at about $25 to $30 per brew:
7lb base malt @ $1.15 /lb = $8.05
1lb special malt @ $1.55 /lb = $1.55
2lb DME @ $4.00 /lb = $8.00
1 pkg dry yeast $2.00 = $2.00
1.5oz hops @ $4.00 /oz = $6.00
1lb corn sugar $2.00 = $2.00
Shipping = $3.50 ($7.00 / 2)
Total = $31.10
If I trim the DME to 1lb and the hops to 1oz, that cuts the price down to about $25. Assuming two brews a month, that comes to $50 to $60 for ingredients.
My efficiency is creeping up, so I should be able to cut the DME and sugar more, maybe even eliminate it soon for some brews.
Really, once you get the equipment complete (like that will ever happen), this is not that expensive a hobby.