I know- I already made 25 lbs of tomatoes into salsa. But then I was at Kroger and discovered 1) that they sell the same packets I use for salsa mix and I thought I could only get at Walmart and 2) that there is a HOT version of the salsa mix. So we had to try it.
I just got one packet to try, so that only required 6 lbs of tomatoes. I got these from the Market for $1.50/lb so that is $9 of tomatoes. The salsa packet was $2.50 and I used about $0.25 worth of vinegar (maybe less but I want easy numbers here). We ended up with 2 pints and 2 quarter pints of salsa. That makes the price per $3.36 per pint and about $0.84 for the tiny quarter pint jars.
Conclusion- yes the hot salsa is tasty, NO it is not more economical to get tomatoes just per pound instead of by the 25-30 lb box. Of course if you grow your own tomatoes successfully and then can them, a small batch would be very well worth the price of just the salsa mix.