Couldn't resist:
BARKER: 'O's!
CORBETT: 'O's?
BARKER: 'O's.
(He goes to get a hoe, and places it on the counter)
BARKER: No, 'O's!
CORBETT: 'O's! I thought you said 'O! (he takes the hose back, and gets a hose, whilst muttering) When you said 'O's, I thought you said 'O! 'O's!
(He places the hose onto the counter)
BARKER: No, 'O's!
CORBETT (confused for a moment): O's? Oh, you mean panty 'o's, panty 'o's! (he picks up a pair of tights from beside him)
BARKER: No, no, 'O's! 'O's for the gate. Mon repose! 'O's! Letter O's!
CORBETT (finally realising): Letter O's! (muttering) You had me going there!
(He climbs up a stepladder, gets a box down, puts the ladder away, and takes the box to the counter, and searches through it for letter O's)
CORBETT: How many d'you want?
BARKER: Two.