Sunshine substitute shortage

When I used to bus to the city I would pop into one of the cheap stores and buy a large bottle of low dosage Vitamin D3 tablets for not very much. So, the other day I went to my local small supermarket and they had run out and only had the small, very expensive ones left, about £6.00. Was in my large supermarket today and they only had a small pack for £9.00 left. Then went into Boots and they had none so finally ended up at The Range and bought a large bottle for £1.99. Now before anyone comments, no I didn't want to be visiting all those stores but if you take Vitamin D3 each day you may want to think about buying some now.