I've often found them at the bed and bath shops.

how much is too much? get them made exactly to fit and the cost would be about $50 for a 30X40 (i guessed on your height)

https://www.blinds.com/p/blindscom-light-filtering-cellular-shade/503415

i've ordered many blinds from them and they're great.

economy cellulars? $40

https://www.blinds.com/p/blindscom-economy-light-filtering-cellular-shades/530122

do an inside mount measurement for a cleaner look and fit.

still too much? roller shades. $27

https://www.blinds.com/p/blindscom-signature-light-filtering-roller-shade/503432

Thanks, Beth! The windows are 30 wide and 80 long. I literally could't find anything off the shelf in that dimension, and blindstogo was $450 for two. So the blinds.com options seem great!

oh ok,,i misread what you want. I've actually seen the ones in the store over 60". don't know about 80. did you look at Lowes? they have a large selection of blinds.

if not, try blinds.com. they will send you out free samples and the customer service is superb. quick shipping as well.

I'll check lowes!