DELL has a site for this:
http://en.community.dell.com/techcenter/enterprise-client/w/wiki/2065.dell-driver-cab-files-for-enterprise-client-os-deployment.aspx
Where you can download CAB directly and use them in MDT or SCCM.

Lenovo:
http://support.lenovo.com/en_US/detail.page?LegacyDocID=tvan-admin
ThinkVantage Update Retriever – you can use this for download of SCCM driver package or alle driver and software for the Lenovo models.

http://support.lenovo.com/en_US/downloads/detail.page?DocID=HT074984

Where you can download CAB directly and use them in MDT or SCCM.

HP:
http://h20331.www2.hp.com/Hpsub/cache/509658-0-0-225-121.html
You can download HP SoftPaq where HP has SCCM driver package or standalone drivers for there models.

Fujitsu:
Driver packages for selected Fujitsu systems
This driver collection is designed for supporting a first installation of the selected Fujitsu systems.
http://support.ts.fujitsu.com/content/sccm.asp?LNG=COM&LNID=1

Microsoft:
Driver Pack for Surface Pro

https://technet.microsoft.com/en-us/library/mt210833.aspx

Microsoft Surface Deployment Accelerator

https://technet.microsoft.com/en-us/library/mt621179.aspx

 

HP Elite Pad 900 Guide:
http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?lang=en&cc=us&contentType=SupportManual&prodTypeId=5169094&prodSeriesId=5298028&docIndexId=64179