Rockwell via eBay offers its Rockwell Sonicrafter F30 3.5-amp Oscillating Multi-Tool Kit for $49.90 with free shipping. That's the lowest price we could find by $11. It includes 30 accessories and a carry bag. Features include:
1 ton of holding force
variable speed selection
4° blade oscillation angle
universal fit system that works with all major brands of accessories
10-foot power cord
You very likely are putting your laptop battery into an early grave.