Oh yeah, getting them all spayed and neutered would break the bank! haha. UNLESS you have a low cost spay/neuter clinic near you. I have one, which is where I got my two outside cats fixed, it was $75 for the girl and $65 for the boy, they needed shots too. It would have been like $45 for him without shots and $55 for her without shots. Thats a pretty good deal, because even my regular really great vet wanted like $180 for each of them because they weren't technically strays.
But where the vet comes in is where it gets really expensive. But I don't take mine to the vet very often, to get their shots I take them to the Mobile Vets we have around the area. They charge like $7-10 for their yearly shots, give me a rabies tag and I'm good to go. Its SO much cheaper because I'm not paying exam fees for them. I don't know if you guys have those up there, but if you do; its MUCH cheaper than a regular vet.
But I still have a great relationship with my regular vet and I have a separate rabbit vet.
I'm super jealous of your garden plot. I'll take a picture of mine...its SMALL. haha. I think sandy soil does really well to grow things. It drains really well, and watermelons LOVE sandy soil. Also, if you were to get lavender, it would love your sandy. haha. Our soil is this black, soft soil, its like you poured it out of a bag into the ground, but its just there. Its great. My roses love it and so do I!