Help re cashback sites please

Butterfli

I want to buy some sofas from argos and take advantage of their offer of 15% off which ends today plus their £10 and £20 vouchers for spending over £100. I'd also like to earn cashback if possible.
I'm a member of Mrs cashback and GreasyPalm and have jsut signed up for TopCash Back.
My internet connection is playing me up and I'd be really grateful if any kind person could cast an eye over these sites and advise me which to go for.

Topcashback say they offer 3% but MSE says not, Mrs Cashback don't seem to offer with argos and GreasyPalm is 0.75% - all this is confusing me so if anyone has a few minutes to check for me I'd be very grateful.

dazza.mk

I'd go with Topcashback, as their rates are above the others.

Note, others have mentioned that the vouchers for orders online must also be spent online you will get (for over £100 spend)

a £10 voucher code (valid until 31st Oct)
a £10 voucher code (valid 1st Nov - 30th Nov)

So you'll have to pay delivery charges twice!. (In case this impacts your decision)

BargainGalore

Topcashback the other two are rubbish