MySQL Left Join - Appending to variable

I'm joining two tables.  

Let's say table one is...

Table Name: items

Item        ID
Widget    5

Table two:

Table Name: prices

Item Price         URLID
25.00               item/5

My SQL goes like...

SELECT *
FROM items t1
LEFT JOIN prices t2 ON t2.URLID = 'item'.t1.ID
WHERE t1.ID = '5'

What would the proper syntax be to do that?

As you can see - ID's variable in the first table (in this instance 5) relates to the 'item/VARIABLE' in the second table (in this instance, item/5).

The " t2.URLID = 'item'.t1.ID" is apparently wrong syntax - as it doesn't work.

How would I properly phrase that?

Thanks!