tortoiseshortoises on "need CHEAP options"

Already have beds encased and interceptors, but the bastards found their way to the bed anyways. I can't afford a pro, I really can't even afford to keep taking my bedding to the laundromat every week. I don't have my own washer and dry, I don't have a vaccume (no carpet)... I thought they were gone, but discovered them in the bed tonight!
What is a good chemical I can get? Already have de, and that's clearly not enough. I work 6 days a week and just don't have time to be constantly dealing with this! I am at my wits end and ready to try dosing myself with ivermectin if I can't get a real solution!!!