etymology of `buy'/`sell' in Albanian (and other IE l.)

Hello!
Can anybody offer any plausible etymology for the Albanian words
ble (to buy) and
shes (to sell)?
I have recently studied the terms for buying/selling in all the IE
languages for which I had any source at hand, but have not found
anything similar to these Albanian words.

P.S.

BTW, there seem to be 3 really old IE terms for something
concerning specifically `exchange of goods':

- *wes-no / *wos-no/na: or similar (Gr. o:nos, o:ne: `exchange,
price', o:neisthai `to buy', Lat. vendere <- venum dare `to sell',
veno `for sale')

- *per-k- / *pre-k- (Lith. pirkti `to buy', OIr. reccaim `I sell')
/ *per(-na:)- / *pra:- (Gr. perne:mi or pipra:sko: `I sell')
-- all said to be from *per `through, over, ...'

- kWri:-na:- / kWre-n- ? (Sanskrit kri:na:ti `he buys' ~ OIr.
crenim `I buy', Welsh prynu, Cornish prena)

Is this OK?