My latest Al Rosen addition is a sweeeeet dual relic -- complete with old-school wool jersey swatches -- from the Ultimate Legendary Materials subset of 2006 Upper Deck Ultimate Collection. It ran me a paltry $4.86 delivered.
The card features a classic photo of Rosen posing with a bat in addition to the two die-cut windows which spell "AR" and house the wool. It's numbered 20/55 and when it became available I knew I had to have it as I really like the card and had never seen it before. Both relic windows seem to have a seam going through them.