Sorry I'm late-
For slapback I've used the following...
Analogman AR20DL (Dan used this for a while too)- http://www.buyanalogman.com/AR20DL_Analog_Delay_p/am-ar20dl.htm
They don't make them anymore. I sold mine on Criagslist and it sold very quickly. Great for slapback, but not worth what you'll have to pay to get one.
Ibanez DE7 - this is by far the best value out there. does great slapback and much much more for a very low price compared to what's out there. highly recommended. don't let its looks/price fool you, solid pedal with a great sound. i've owned 2 or 3 of these. every time I sell it I end up buying another one 'cause I miss it too much. *it looks like these may be discontinued so I'd snatch one up if you're at all interested.
http://www.zzounds.com/item--IBATLDE7
Danelectro Reel Echo- as others have mentioned, this is a very cool pedal. Dan used/uses one and so does/did Dante from Hacienda. I liked it a lot but sold it because I didn't like the way it colored my sound. It could have been my rig, or some other factor, but I always got a certain flavor in my tone from this thing and I just wasn't digging it. Obviously it's a great piece of gear though and folks have success with it. here it is on ebay for $129 shipped, new in box. only 2 available, and I'm not sure if they'll ship to AUS
http://cgi.ebay.com/NEW-Danelectro-Reel-Echo-simulated-tape-effectl-DTE-1-/230573054526?pt=Guitar_Accessories&hash=item35af399a3e#ht_1291wt_907
Earthquaker Devices Ghost Echo - I've never used one but I've wanted to buy one for a very long time. Reverb pedal AND can be set for slapback echo as well. Made in Akron Ohio by the friend-of and former tour manager-of TBK. Particularly appealing to me because my '72 Fender Musicmaster has no reverb. But if you already have 'verb in your amp, you may be better off spending your money on an actual delay/echo pedal.
http://www.earthquakerdevices.com/devices/ghostecho.htm
*Oh just wanted to add, don't forget to get the AC adapter for whatever you end up with. Delays/Echos are notoriously hungry for batteries.
"When the power of Love overcomes the love of power, the world will know peace." -Jimi Hendrix