I’m looking at only tracking and my own packaging.

If you want to use your own pakaging you will probably have to get prepaid registered stickers which don't include postage.

More expensive than prepaid envelopes.

So it works out about the same as an extra small satchel though my post business. 

Or a 250g parcel (own packaging)  through AP My Post Business, depending on your savings band. Also good to remember that purchasing AP Tracked Letter products does NOT count towards your My Post Savings Band - I think they're the only AP product that doesn't. So I often send what COULD be tracked letters as a 250g parcel, depending on what zone the address is; on my savings band it is almost as cheap AND counts towards my AP Saving Band. 

Roughly, but any bought before the last price rise are still better value. 

Hmm I don’t have the 250g option on mine. I’m going to have to look in to this. Thanks 

I am talking about importing eBay orders to AP Business. Use My Own Packaging; set weight at 0.2 Kg and size at whatever -  mine is something like 27 x 22  x 19 and only needs to change for parcels over 1 kg if I use my own packaging.  The 250g cost will be shown.