I have received emails from MSC's I never registered with through them and have found companies with sporadic work in my city. They are 100% legit and are not asking shoppers for any money.
Here is the list of all the companies that will post jobs with them when they are having difficulty getting them filled:
www.a-closer-look.com
www.aboutfacecorp.com
www.acpview.com/mystery_shoppers.htm
www.actionresearchgroup.org
www.alta360research.com
www.amusementadvantage.com
www.apartmentmysteryshopper.com
www.apexmysteryshopping.com/become.html
www.apply2jobs.com/tng
www.bizshoptalk.com
www.bldschedulers.com
www.brgus.com
www.businessobservations.com
www.chcsolutions.org
www.compliancesolutionsworldwide.com
www.conferoinc.com
www.consumerresponseutah.com
www.contactmms.com
www.creativeimage.net
www.crg-web.com
www.ctcss,com
www.ctcss.com
www.customerimpactinfo.com
www.customerperspectives.com
www.customerserviceexperts.com
www.dawnhuntsdatabase.com
www.DPRECRUITING.COM
www.drivelineretail.com
www.edlunddataservices.com
www.eliteshopperforce.com
www.ellismysteryshopperjobs.com
www.epmsonline.com
www.ESPSHOP.COM
www.facebook.com/scheduler.karim
www.faithperceptions.com
www.frances-scheduler.com
www.gfkmysteryshops.com
www.goodwinhospitality.com/shopper
www.icuassociates.com/Shopper/apply_to_shop.html
www.imscinfo.com/resources/newsletter-sign-up/
www.informars.com
www.insideevaluators.clientsmart.com
www.insideevaluators.com
www.integrityconsultants.us
www.intellaprice.com
www.internationalservicecheck.com
www.intouchinsight.com
www.isecretshop.com
www.jancyn.com
www.jmridgway.com
www.joyventures.com
www.JoyVentures.org
www.kateschedules.blogspot.com
www.marketviewpoint.com
www.marketwi.com
www.measurecp.net/shopperSignup.asp
www.medicalmysteryshopppers.com
www.movieassignments.com
www.MPulseSolutions.com
www.myshopsol.com
www.mysteryshopmsi.com
www.mystshop.com
www.naturalinsight.com
www.nimltd.com/contact-us/shopper
www.nimresearch.com/
www.northforkresearch.com
www.nsiteinc.com/shoppers/apply.cfm
www.nsiteinc.om
www.nwlpc.com
www.ocean-road-consulting.com
www.onsiteevaluations.com
www.pinnaclemysteryshopping.com
www.ppiadvantage.com
www.primosolutionsllc.com
www.privateeyesonline.net/Shopper_Database.html
www.qualityscheduling.com
www.rbgshoppers.com
www.rcm.komtel.com
www.reeva.goldman@gmail.com
www.ReflectionsMS.com
www.ritterassociates.com
www.salesqualitygroup.com
www.sasrlink.com
www.sassieshop.com/2hillidunlap/index.norm.php
www.sassieshop.com/2kern
www.sassieshop.com/2mercsurveys/http
www.sassieshop.com/2proreview
www.sassieshop.com/2rcms
www.sassieshop.com/2rsg
www.sassieshop.com/2serviceperformance
www.sassieshop.com/sassie/SassieShopperSignup/Signup
www.satisfactionservicesinc.com
www.SeeLevel.com
www.seelevelhx.com
www.SeeLevelXL.com
www.sentrymarketing.com
www.service-smart.com
www.serviceallianceinc.com
www.serviceconnectionsinc.com
www.serviceevaluation.com
www.serviceexcellencegroup.com
www.serviceimpressions.com
www.serviceintelligence.com/jobs/mystery-shopper.html
www.servicesavvy.com
www.servicescouts.com
www.servicesense.com
www.ServiceWithStyle.com
www.shop4.intouchshoppers.com/shopper/en/
www.shopper.bildandco.com
www.shopperjobs.com
www.shoppers.jancyn.com
www.shoppers.salesqualitygroup.com
www.shoppersconfidential.com
www.shopperscritique.com
www.shoppingwithdebby
www.sinclaircustomermetrics.com
www.sinclaircustomermetrics.com/
www.spgweb.com
www.spiesindisguise.com/shopapply.asp
www.strategicreflections.com
www.summitscheduling.com
www.summitscheduling.com/
www.summitscheduling.com/company
www.testtrackresearch.com
www.theguestcheck.com
www.theinstoregroup.com
WWW.ThePetFirm.com
www.thetrainingfactor.shopmetrics.com/login.asp
www.trendsouce.com/msi
www.Verites.com
www.w3.wisintl.com/