Will this color will be harder to find/more expensive?

Gonna be hard to find in anything other than linen (which wrinkles when you look at it). I don't think it'll be more expensive, just harder to find. Also, if you're having the guys renting they may not be able to. Usually rental places only have a few (black, navy, blue, maybe gray) standard colors. They guys might have to buy something g in a cream, tan, or flax color.

My dh got them from Macy’s Backstage. It was pretty good deal. However, no jacket since it’s a beach wedding and too hot for them.

That's a common color. Any suit rental shop will carry it.

Looks like Tommy Hilfiger - Check Macy’s
We bought our suits on Macy’s.com clearance

Https://www.mensusa.com/products.aspx?id=22978

Check out ASOS for it too!

To me this looks tan. I would look at Black Tux. They have a tan suit that could either be rented or purchased.

That color is pretty common anymore. The tux shop we are renting from had this exact color along with 5 other colors on display and I immediately fell in love. It was maybe $20 more than some of the others. Ours came out to $150 for each rental.

Men's Wearhouse and most suit rental shops carry the color at no extra charge.