Toddler-Friendly Budget Speakers?

Looking ahead to our baby becoming a toddler, can anyone recommend a good pair of relatively cheap (by audiophile standards) toddler-friendly speakers? I guess the most important factor is something that won't tip over easily. Whether that means floorstanding or (bolted) standmount, I have no preference. I should add that we have a pretty small space, so huge speakers won't really work. The other factor is durability, specifically some solid set of durable and effective grilles to keep prying little fingers from the delicate driver units. I realize that's a rather difficult characteristic to find, which leads to the final factor: relatively low price. So that if they do see some damage, I can live with the loss in value. Definitely something around $1000 or under (well under preferable), used or new.