Hi Alice. That's a very good question. Been looking for some for a couple of years that aren't too spendy. There are a few online choices that offer bulbs and glass vases. Also online choices of just glass vases which are are way too spendy. Some local nurseries have both just depends on your area. They are also at a reasonable price at big box stores ie;Home Depot, just different designs than spendy bulb styles.
I have 17 amaryllis I am growing and for some bulbs I just placed glass marbles in the bottom of a couple glass vases with distilled water. I have compromised on vases I already have not designed for amaryllis bulbs still ok did same last few seasons.