Over the time that i've been searching for anything about Oscar's Orchestra, I located mentions of products and perhaps even toys of characters from the show, from a magazine that recently sold on Ebay to a camera being sold in Korea (Although i've lost the link to the listing, the seller had owned the camera since 1997)
There are bits and pieces about Oscar scattered about on Animation World Network, including this bit about ToyFair being interested in it, specifically for products to be shown at the 1997 American International Toy Fair being brought up, I can find no other information or photos for this. I would absolutely go wild to see an Eric or even an Oscar plush, that'd be neat!
There exists a shirt that was made to promote the Pittsburgh Symphony Orchestra's attempt to beat the world record for World's Largest Orchestra... I'll get into that next time.