13 Boomerang, 9 SLC, and 8 B-TR clones
Some of the logos are low quality but there are some pretty good scans as well. Seems like a good place to start.
The site is loaded with thousands of corporate logos in Adobe Illustrator EPS vector format. Downloads are free, but can only be used for personal use. I'm not sure if they have specific coasters, but there are several six flags logos available.
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