My chain tensioner is gone, now what?

[Dakarboy]

I have been noticing that my bike has been squeaking around the rear wheel area. I looked for anything impeding or scraping, but nothing. Yesterday I noticed my whole chain roller is gone!!
Now I'm riding the Amageza Q2 on Saturday, and I'm sure that something will give with all the jolting etc? Where can I get a new one and how much will I get flossed for it? Or should I ride without it on saturday?
Thanks dogs!

 

[Crossed-up]

 

[Dakarboy]

 

[lecap]

 

[Grootseun]

 

[Tr0jan]

 

[Dakarboy]

 

[alexTH3man]

 

[Dakarboy]

 

[alexTH3man]

 

[Dakarboy]

 

[lecap]

 

[Dakarboy]

 

[VMAN]

 

[rooigevaar]

 

[Dakarboy]

 

[lecap]