This turned up on adorama's site today. It sounds like the size is slightly off for Ilford postcard paper, but it might be worth trying out and seeing if it fits. I'm not going to since I have a 4x6 speed easel, but for $17, it might be worth a try...

easel

Just so you guys know, I'm currently looking for other easels on ebay and elsewhere, so I'm keeping my eyes peeled for 4x6 speed easels too. If I find any, I'll post the link here. I know my 4x6 easel makes doing the postcards a breeze.