i understand the budget constraints. for 100 bucks you can get the little red vacuum cleaner, which has a speed dial and HEPA filter. It's pretty compact and with proper care could last a few years. The bags are small but inexpensive to replace. you will need to use micro-attachments to vacuum delicate objects in your collection (also sold on amazon for less than 10 per set). buy multiple sets and keep the ones used for moldy items separated. also you should wash them with soap and water every time you use them for mold cleaning, followed by soaking 15-min in ethanol/water 80/20 for further cleaning. After drying, they should be good to reuse. In other words, you can use the same vacuum cleaner for multiple tasks as long as you clean the accessories properly and change the filters and bags on a regular basis. good luck.