Groupon offers Online Guitar/Bass Lessons from Dangerous Guitar with prices starting from $5. That's as low as $1.50 per month and the best deal we could find. It includes access to 650 high-definition instructional videos. The deals:

• Three months of lessons for $5 ($34 off)
• Six months of lessons for $9 ($67 off)
• One year of lessons for $18 ($135 off)
• Two years of lessons for $35 ($269 off)
• Three years of lessons for $54 ($404 off)