Hi. The postage costs I charge are actual Royal Mail rates for the weight of the item. I add nothing to these prices. I prefer to post using either 1st class recorded or special delivery. However if you request I can send via standard parcel delivery, this will just take longer. Please note 1st class delivery can take 2 days to arrive. I can add items together, so if you have an enquiry for certain items plus postage let me know. I do not offer a collection service. I will only post on a Friday if you specify this or pay special delivery with the £2.00 supplement for guaranteed Saturday delivery. I prefer paypal. But can accept cheque or postal order as long as you are happy to wait for the money to clear. I can offer a subscription service to the plankton(PHYTOPLANKTON AND ZOOPLANKTON) I sell. I can send you a request for payment on a regular basis ensuring you have a constant supply. If this service interests you let me know and I will offer this at a reduced rate.