You could have a try at ebay, they do both firsthand from retailers and secondhand from new mums. The other option is to buy from your usual clothes stores in a couple of sizes up to allow the extra 'bump' space.
well, it'll be me too soon! When i asked a pal in a similar situation she said she had used New Look, H&M, - reasonable prices and sizes, even mothercare and mamas and papas and just thinking I think Asda have quite a good selection of sizes.
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Hope this helps.
Annie
Thanks again x