At $19.95 per month for up to 3 users.
Will not handle payroll.

QuickBooks

$9.99 per month for 1 user; additional users at $4.99 per month.
Payroll available at additional $9.99 per month.

ePeachtree

$99.00 per month for 2 full users.
Payroll included.

Oracle Small Business Suite

From Intuit - the Market Leader
Easy to set-up, easy to use

QuickBooks Basic
QuickBooks Pro

Peachtree has by far the most functionality in its price range. Flexible and open to interface with other systems. Steeper learning curve than QuickBooks.

Peachtree Accounting
Peachtree Complete Accounting

Lower cost, easy to use - from Peachtree

One-Write Plus