Buy a Epson R220 refurbished printer from Epson for $71, slap your labels onto the disk, slap the disk into the printer, and use the provided software, hit print and walk away.
You spend what $20 if not more for 100 lables? Thats crazy after buying just 4 packs it would pay for the printer and you can jsut buy printable media and toss away the labels for ever. And it has the cheapest in IMO at under $2 a card from mertine when you buy thier $55 speacil and get 8 full changes.
Not to mention all the wasted lables from misalignment or not going down into the print right every time being slightly off to one side. I been printing labels off my printer for 3 years and you would have to pry it from my cold damp hands before I will go back to a regular printer and labels again.