Boho/lace dress under 300

Check modcloth!

Or etsy!

Yes, Etsy!! Or sell/trade wedding groups

Maybe try to find a wedding dress consignment shop near you.

Try free people and maybe asos.

My sister wore a knee length ivory dress she bought online from Kohl's

China?

Eliminate the words BRIDAL or WEDDING from a search online and you'll get a ton. If you search with those words then the price will be inflated 20-50%

I agree with Emmy. I've had a couple of friends get dresses made in China for under $300. They just sent them pictures along with measurements and voila! Perfect dress

Try Free People .Often their dresses cost a bit more than 300, but if you look a bit online at places likes Saks and Macys theses same dresses are often on clearance for amazing prices that you can't get on Free People. I have had good experiences with custom made clothing from china, but haven't tried wedding dresses.

Try Etsy.com or even Ebay, if I were you I would look at getting a vintage dress. A lot of the vintage dresses of the 1910s and the 1970s are that typical bohemian style. Mine is from etsy and it was 185. Here is the style I am talking about: https://www.etsy.com/listing/200478378/antique-edwardian-crochet-dress-vintage?ref=sr_gallery_6&ga_search_query=1910%26%2339%3Bs++boho&ga_search_type=vintage&ga_view_type=gallery