When it comes to buying a bulky product like sheets of chipboard flooring, most of your regular DIY stores just simply will not deliver these very heavy products. Someone they cannot quite get beyond the cost of delivering vs the relatively low cost of the product.
There is just one major DIY store that does deliver, you can buy Wickes Chipboard Flooring online and have it delivered, after that there is little other choice from recognisable names. However there is another recognisable name where you can buy tongue & groove chipboard flooring online and that place is eBay.
Many smaller independent building merchants sell there products online through eBay, so you can buy knowing you have the protection of eBay and Paypal should anything go wrong.
There is actually a large choice, with many options even with FREE delivery, you also might be lucky to find someone selling some locally for a great bargain.