Next doors builder is using the B&Q bags that hold a couple of tonne. I asked him same question and said it was cheaper than getting a skip. I thinks its €20 for the bag and €120 to remove it.
I recently paid 280€ for a medium sized skip in Cork City. Seemed a bit on the expensive side but managed to fit everything (beds, old kitchen et) inside.
I have used SKIPPO BAG (www.skippobag.ie)
Get bag, fill (1.25 tonnes), contact, pick up & pay (€99.99).
I believe they do actual skips also, check the website.