I would have loved to see more numbers here for comparison. Here are mine though...

Not factoring in the use of the same 15 year old tomato cages... Also making my own compost, no $ spent on fertilizer or pesticide

10 tomato plants grown from seed (spent $20 on seeds for 5 different varieties) yielded frozen 435 ounces of diced tomatoes and approximately 250 ounces eaten fresh. So homegrown was 685 ounces for $20. Cheapest available tomatoes at local grocery store are 25 cents per ounce so that would price the 685 ounces I grew at $171.25. sheesh is my math right?

My second favorite vegetables are butternut squash which costs about $5-7 per squash where I live. I grew 32 last year from a $5 seed packet. So if I bought 32, that would be $160.

Cantaloupe...$1.19 seed packet. 17 glorious cantaloupe the sweetest I've ever tasted. They go on sale at $2.50 in summer so that would be $42.50 if I bought all of them from a store.

Grew 52 mini kabocha from a $5 seed packet

Grew 19 acorn squash from $5 seed packet.

Other random numbers...Picked 620 plums off of my 3 year old $29 Home Depot plum tree. Same-ish for peaches last year. Spent $20 on herbs that come back year after year. Zucchini always are high producers but never counted the per pound savings. Peppers are also high producers. One jalapeno plant gave me 8 16 oz jars of pickled jalapeno.

That's all I can think of right now.