I've used reship plenty of times. It can get expensive, but they have shipping calculators on their website too. You should be able to ask the retailer the size and weight of the box being shipped to have a general estimate of how much reship will cost you.
A word of caution though, most, if not all, reshippers don't like to reship gun parts and accessories - including optics. I've gotten away without any issues, but it's a risk that it won't get to you. Hope this helps.