Well, prices have gone up for some chips in recent years. And, not meaning any offense, but if you only paid $250 for custom chips, it's unlikely they're from the same company that makes chips for casinos, unless you purchased them a LONG time ago or got a tremendous bargain. Do you recall the name of them? How long ago was this? How many chips are in your set?
Not to derail this thread, but there's one main company that makes clay casino poker chips, it's Paulson. Many years ago, you could go into their Vegas retail shop and buy a set of their fantasy chips for around $1/chip. These are now worth about $3-4/chip. Mainly because Paulson no longer sells to the public, nor have they readily offered custom options. If you own a set of custom Paulson chips, these are likely worth $5-6/chip now. That's the category in which I found myself in.
There's a couple companies that make the ceramic poker chips, and some of these companies sell to the public (and to casinos). These used to be had for maybe $.60/chip. But to get custom chips from them now, it's around $1/chip, and they aren't really all that popular in the casinos (compared to Paulson clay chips).
There's really only one game in the custom clay poker chip market, and that's CPC (Classic Poker Chips), formerly ASM (American Standard Molding). These are clay, and 100% custom, and start at $1/chip, but quickly move into the 3-4/chip price ranges.
OK, my chip education is done. But honestly, if you are interested in your chip values, drop my a PM with more info, or post a picture of the chip.