I don't know where you are but roaches can be handled cheaply with the proper insecticides that you can use yourself. Blanket spraying is usually pointless and once they are indoors the only way to permanently get rid of them is to put a halt to their lifecycle.
A local handyman shop will have a crack and crevice spray. It comes with a small straw that you use to spray the fluid into, obviously, cracks and crevices. If you go around your basement and hit all of these areas thoroughly then it will, for a start, help keep the roaches out of your area even if they venture into the rest of the house. The Plus is that you won't actually be spraying it out in the open where you, others, or your pets might come into direct contact with it.
If you can, actually look for C&C sprays that mention they contain ingredients that halt the life cycle. If you can get a C&C spray like this then you probably won't have to go any further with treatments that involve spraying.
At the same time, if you can afford it, by a small box of bait traps, also looking for those that contain the lifecycle inhibitor.
Stopping the lifecycle is paramount. Normal sprays will just kill the bugs you see and often not destroy eggs, etc...
I service computers for a living and my office is connected to my home. I had one customer bring in a PC infested with roaches. I didn't realize this immediately, as I had a back log of systems, and a few escaped into my house. Within just a couple of weeks I saw a teeny tiny roach on my kitchen counter, the next day a small one was in the bathroom, and by the end of the week I was seeing them on the complete opposite side of the house in my parlor, climbing around on a rocking chair.
I gave myself a crash course, learned how to hit them hard and by the time these babies had grown up and I was seeing the first evidence of eggs (which happens terribly quickly in warm weather), they were already on the decline and then vanished as quickly as they came.
"All forms of monism - whether in political dictatorships, trade monopolies, or monotheistic spiritualities - are detrimental within all of nature, body and soul. They are born of a need for control and power, and they are sustained by force, oppression and fear. Diversity is crucial to health and sustainability." - Emma Restall Orr