I don't think you'll find true unions at the big box stores.
Picked this style up at Lowes last weekend. My local store has them up to 2" on the shelf.
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I know Aquarium Arts and AZ Shark Reef have some schdule 80 fittings so you might call them up.Ace didn't have any. Lowes had 1.5 and 2" ones but that's to big for me. Double checked Home Depot and they didn't have them. Didn't want to order online and have to wait. Might have to.
Never understood why people use schedule 80. I understand over kill on somethings but schedule 40 is perfectly fine.