A thrift store is a pregnant person's gold mine — so many gently used maternity clothes marked down an insane amount from their original purchase price! On your thrifting journeys, don't forget to also browse online thrift retailers including Poshmark and Facebook Marketplace. Parents who are done having children are often so eager to get rid of their maternity haul that they list them at crazy low prices. During my pregnancy, I've even found plenty of "new with tags" pieces that cost me less than $10.