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Where do I get a types bundle for my chain?

Types bundle is only needed for pre-Metadata v14 blocks and only if SQD does not offer a built-in support for the chain in question. Most chains publish their type bundles as an npm package (for example: Edgeware). One of the best places to check for the latest version is the polkadot-js/app and polkadot-js/api repositories.
Note: the type bundle format for typegen is slightly different from OverrideBundleDefinition of polkadot.js. The structure is as follows, all the fields are optional.
{
  types: \{\}, // top-level type definitions, as `.types` option of `ApiPromise`
  typesAlias: \{\}, // top-level type aliases, as `.typesAlias` option of `ApiPromise`
  versions: [ // spec version specific overrides, same as `OverrideBundleDefinition.types` of `polkadot.js`
    {
       minmax: [0, 1010] // spec range
       types: \{\}, // type overrides for the spec range
       typesAlias: \{\}, // type alias overrides for the spec range
    }
  ]
}