DIY - Buy online tyres and put them on!

Usually online tyre sellers have agreements with retail outlets across the country. But If your seller doesn't offer this option just take your car and your brand new set of tyres to any shop with a tyre machine. Even local shops do this things pretty often and they don't ask the customer where the tires come from. They will apply usual charge for installation and balancing (sometimes they might charge you more because you brought your own tyres).