Amazon offers Kreg KMS7509 4-Feet 48-Inch Mini Trak for $20.99 . Eligible for free super saver shipping.

Product Description:
The Mini Trak can be used to produce countless types of woodshop jigs and fixtures, such as taper jigs and cut-off sleds. An adaptation of our other popular styles of Trak, Mini Trak features a T-slot that captures the head of a standard 1/4" (6mm) hex bolt. The Mini Trak you have selected is 48" (1219mm) long.
Compatible with Kreg Track Clamps. Not for use with Kreg Bench Clamps.

• 3/8" tall x 3/4" wide
• Accepts any 1/4" hex bolt
• 48 inch length