I bought my last lot from Charles Parsons, though in the cheapest price range there's not a huge colour range. Min $50 cash purchase though I'm sure it won't be difficult to reach with someone else. I am not sure how bulky they'll be to post, but I'd be happy to buy and post on. I have just emailed them to see if they have a separate pricelist for the threads as it's not in their general accessories/trimmings pricelist. From memory it was around $4 for a 5000 m spool (Coats brand).
Mum to 3 beautiful children
Small and Large pocket patterns available, for a small donation to Unicef. DIY kits also available for $5 each with free pattern. PM or email me for more info...