Fry's Electronics via Google Express has the Sonic Mania Collector's Edition in-stock for $69.99 with free shipping. Apply Google Express code 15off55 at checkout to get it for $54.99 + tax. Code expires January 5.
It's been out a while, but a cool collectible set and hard to find.
UPDATE: Sonic Mania for the Switch is currently sold out at Fry's but the coupon code should still work until the 5th. Code is for new customers only. Will work on other purchases through Google Express.